#grain {
  height: 415px;
  background-color: rgba(0, 0, 0, 0.8);
  padding-top: 1px;
}
#grain .api-title {
  z-index: 1;
}
#grain .container p:nth-child(1) {
  font-size: 40px;
  color: #fafafa;
}
#grain .container p:nth-child(2) {
  color: #fafafa;
}
#grain .container p:nth-child(3) {
  color: #fafafa;
}
.menu a {
  color: #Fff;
}
#mydiv {
  overflow: hidden;
  position: absolute;
  width: 100% !important;
  height: 415px;
}
#mydiv canvas {
  width: 100% !important;
  z-index: 0 !important;
  height: 415px;
  opacity: 0.5;
  position: absolute !important;
}
.floor {
  margin-bottom: 10px;
}
.floor .bigbox {
  width: 1110px;
  height: 400px;
  background-color: #f8f8f8;
}
.floor .bigbox div {
  width: 350px;
  height: 120px;
  background-color: #ffffff;
  float: left;
  margin-bottom: 20px;
  margin-right: 20px;
  line-height: 120px;
  text-align: center;
}
.floor h2 {
  line-height: 40px;
}
.floor h2:after {
  content: '';
  display: block;
  width: 14px;
  height: 2px;
  background-color: #00bdff;
}
.floor ul li {
  width: 354px;
  height: 340px;
  border: 1px solid #eee;
  padding: 10px;
  box-sizing: border-box;
  float: left;
  margin-right: 20px;
}
.floor ul li img {
  width: 100%;
}
.floor ul li h4 {
  margin: 20px 0 10px;
}
.floor ul li p {
  line-height: 18px;
  margin-bottom: 15px;
}
#returnTop {
  width: 100px;
  height: 100px;
  position: fixed;
  top: 450px;
  right: 50%;
  margin-right: -600px;
}
#returnTop li {
  line-height: 30px;
  cursor: pointer;
  user-select: none;
}
